Long description of the security improvements WebGL makes on top of the OpenGL.
This talk has morphed into a discussion of graphics card and their drivers.
After a long diversion it now comes back to the browser. Graphic drivers are fundamentally insecure and have access to kernel space. WebGL moves web programming out of the sandbox and userspace into a different, less secure area.
Future applications in the browser are going to be less document-based and more visual.